| OCR Text |
Show 7G8 REV. O. P. CAMBRIDGE ON NEW ARANEIDEA. [June 21, Sternum elongate, strongly dentated or notched on its sides, at the insertion of the legs. ABdomen of a subtriangular form, the upper side being considerably and conically elevated. ERIAUCHENUS WORKMANNI, sp. n. (Plate LXVI. fig. 2.) Immature male, length from the spinners to the extremity of the maxillae 2h lines ; height from the sternum to the highest point of the caput 2g lines. The cephalothorax converges gradually upwards to the anterior portion, which is produced perpendicularly into a longish cylindrical neck, terminating with a large massive caput, the occipital region of which is rounded, and the upper side somewhat flattened and sloping gradually to the insertion of the falces ; at the summit of the caput are four small, pointed, tubercular eminences in the form of a quadrangle whose posterior side is narrower than the rest. The colour of the cephalothorax, neck, and caput is yellow-brown, marked in parts with a darker hue, and thinly clothed with short grey hairs; just beneath the caput the neck is paler, giving the appearance of a broad pale neck-collar. The whole height of this extraordinarily developed cephalothorax to the top of the caput equals the length of the Spider. The eyes are in two groups, one on each side of the fore extremity of the caput close to the margin. Each group consists of two pairs, an upper and lower one; the anterior eye of the upper pair is much the largest of the group, and is seated in front and rather at the side of a strong bluntish-pointed tubercular prominence, and close to the margin of the caput; behind this eye is seated the other eye of the pair ; this posterior eye is much smaller and very difficult to discern: taking the two posterior eyes, of the upper pair on each side, as representing the ordinary hind central pair, they are nearer together than those of the fore central pair, i. e. the anterior eves of the two upper pairs. The lower pair is considerably removed from the upper one ; its eyes are contiguous to each other, and of a pale whitish yellow-brown colour, so like that of the surrounding surface as to be almost imperceptible ; their position is very close to the base of the falces on the outer side, about an eye's diameter from the margin of the clypeus, at the middle of which is a prominent point. The legs of the first pair are upwards of five times the length of the Spider, and are considerably longer than any of the rest. All are of a yellowish-brown hue, the femora clouded in parts with a deeper colour ; those of the fourth pair are mostly of a paler yellowish hue with a distinct broadish black-brown annulusabout the middle; a broader but less distinct annulus is also placed near the hinder extremity of the tibiae of the third pair ; some indistinct annuli, of a darker yellow-brown than the rest of the surface, are also visible on the more or less mutilated portions of the tibiae and of the metatarsi of the third and fourth pairs. The three terminal tarsal claws, placed at the extremity of a small supernumerary claw-joint, are small and strongly bent ; the superior claws appeared to have only one or two denti- |
